
Types of Microscopes
Maya and Arjun look at a drop of pond water with Mrs. Patel and discover how simple and compound microscopes help us see a tiny world of microorganisms that is invisible to our eyes.
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Maya and Arjun look at a drop of pond water with Mrs. Patel and discover how simple and compound microscopes help us see a tiny world of microorganisms that is invisible to our eyes.

During Science Fair Week, Lila and Jay discover a forgotten sandwich covered in fuzzy patches. With help from Ms. Rivera and a microscope, they explore the invisible world of bacteria—how these tiny living things grow, why some spoil food, and how we can stay healthy.

In Grandma Rosa's sunny garden, two curious kids pull up a bean plant and discover tiny bumps on its roots—and learn how special bacteria help plants capture nitrogen from the air.
Algae are tiny plant-like organisms that live in water and use sunlight to grow. When algae multiply quickly, they can form an algal bloom that turns water green. Blooms often happen when extra nutrients enter the water. Too much algae can block sunlight and use up oxygen, making it hard for fish and other lake life to survive.
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